Pitman



Nov. 23

C. SLY ET AL PITMAN I g/705 0111, la. 75 7? Inner INVENTORS 15' Filed May 8 Patented Nov. 23, 1926.

UNITED STATES PATENT OFFICE.

CLAUDE SLY, JOHN EDWARD MONTGOMERY, AND IIERVEY THOMASTRANMER, OF TW'IN FALLS, IDAHO.

PITMAN.

Application filed May 8,

This invention relates to an improved pit man for use principally in connection with mowing machines but it is to be understood that the pitman may be used wherever a pitman of this type may be used.

One object of the invention is to provide a pitman having a stationary and a movable jaw and to provide an improved construction of movable jaw and improved means for pivotally mounting this movable jaw and also improved means for securing the movable jaw in an operative position with respect to the stationary Another object of the invention is to so construct the movable jaw that it may be pivotally mounted in a socket formed in the body of the pitman adjacent the inner end of the stationary jaw and include a heel or arm portion extending into a recess or pocket formed in the pitman for engagement by a wedge releasahly fitting in this recess, thereby permitting the wedge or block to hold the movable jaw in an operative position.

Another object of the invention is to so construct the movable jaw that the jaw portion and arm or heel portion thereof may be provided with means for interlocking engagement with the body of the pitman to brace the jaw against movement axially of its trunnion portion when in an operative position.

Another object of the invention is to so construct this pitman that when so desired the movable jaw may be readily swung to an inoperative position to permit disconnection of a rod from the pitman.

Another object of the invention is to so construct this pitman that the movable jaw may be formed as a single casting thereby providing a single piece structure which may be cheaply made and which may be easily and quickly put in place when assembling the movable jaw with the body of the pitman.

This invention is illustrated in the accompanying drawings, wherein Figure 1 is a top plan view of the improved pitman;

Figure 2 is a longitudinal horizontal sectional view through the outer end portion of the pitman with the movable jaw removed;

Figure 3 is a vertical longitudinal secti0n- 1924. Serial No. 711,862.

al view through the shown in Figure 2;

Figure 4: is a transverse sectional view taken along the line 44 of Figure 1;

Figure 5 is a longitudinal sectional view through the movable jaw;

Figure 6 is a view in elevation looking at the inner face of the movable jaw with the heel portion broken away.

This pitman is, in the present illustration, intended for use in connection with a mowing machine and has, therefore, been provided with spaced side portions or arms 1 which extend from a head 2 and have been provided with openings 3 so that fastener bolts may be passed through these openings to properly connect the pitman with an operating element not shown. A stationary jaw 4 extends from the outer end of the pitman and is provided with a recess or pocket which leads from its inner face. The head portion 2 of this pitman has been cut out adjacent the inner end of the stationary jaw to provide a bearing socket 6 which at one end opens through the upper face of the pitman and has one side portion opening through the end of the pitman. A recess 7 which forms a pocket leads from the bearing socket 6 inwardly of the head 2 and at one side is extended to provide a recess 8. The side walls of the recess converge toward the socket 6 with the converging extremities of said side walls spaced apart a distance less than that of the diameter of the socket 6 the arrangement of the side walls providing what may be termed inwardly directed ribs 7 positively separating the recess 7 from the socket 6. The wall of the pocket 7 between the recess 8 and the bearing socket 6 has been provided with a groove 9 extending longitudinally of the pitman and serving a purpose to be hereinafter brought out. A rib 10 is positioned at the inner end of the inner face of the stationary jaw and intermediate the depth of this rib there has been provided a notch or groove 10 which serves a purpose to be hereinafter brought out. It should be further noted that the head 2 has been provided with a face or portion of the pitman shoulder 12 extending downwardly and outwardly from the lower end of the bearing socket 6 and curved longitudinally to provide a good bearing surface for the movable jaw.

The movable jaw is provided with a jaw portion 13 having a cup or recess 14c leading from its inner face and adapted to co-operate with the cup or recess of the stationary jaw so that a rod to be operated by this pitman may have a ball at one end fitting between the stationary and movable jaws and into the recesses 5 and 1%. Therefore the operated rod will be connected with the pitman by a ball and socket joint. T he inner end of the jaw portion 13 is enlarged to provide a trunnion 15 which iits into the bearing socket 6 and at the juncture of the jaw portion 18 and trunnion 15 there has been provided a shoulder 16 having intermediate its depth a tooth 17 for fitting into the notch 11. It should be further noted that the trunnion terminates short of the lower face off this movable jaw and that the inner end portion of this movable jaw has been beveled-to provide a face or shoulder 18 constituting a bearing face and resting upon the bearing face 12 when the movable jaw is in place. An arm or heel 19 extends from the opposite side of the trunnion from the jaw portion 13 and lits into the pocket 7 which leads from the socket 6, it should be noted that this heel or arm 19 is disposed at such an angular relation to the jaw portion 13 that when the movable jaw is in an open position and engaged with the shoulder 20 the heel will be engaged with the wall ot the pocket- 7 at one side thereof. lVhen, however, the jaw is swung :to the closed or operative position with its shoulder 16 in engagement with the rib or shoulder 10 and its tooth 17 fitting into the notch 11, the heel will have engagement with :the second side wall of the pocket 7 and the rib 21 provided upon the free end portion o1 this heel will fit into the recess 8; A rib 22 is provided upon this heel between the trunnion 15 and the rib 21 and fits into the groove '9 when the movable jaw is in the suitable pin fastener 23 which extends axially through the trunnion 15 and the movable jaw is in the operative position, the tooth 17 and the rib 22 by fitting into the groove 9 and notch 11 will serve to brace the movable jaw against movement axially of the trunnion and, therefore, strain will be removed from the pivot pin or rivet.

lVhen the movable jaw is in the operative position it is desired to have this movable jaw securely held against movement out of the operative position and, therefore, there has been provided a wedging block 24: which is of such size and shape that when the movable jaw is in the operative position, this wedging block will slide freely into and out of the pocket 7 but will have a close fit when in place. A lug 25 has been formed upon the upper end of this block to permit of its being easily lifted from the pocket 7 and this lug has been provided with an opening 26 so that a wire or nail may be passed through the lug to assist in removing the lug in case it should, for any reason, become stuck tightly in the pocket. In order to cause the wedging block to be .t'orced into tight engagement with the heel or arm 19 of the movable jaw and also permit of the block being securely held against accidental removal, there has been provided a set screw 27 which passes through a threaded opening 28 formed in the side of the pitinan head 2. This opening 28 communicates with the pocket 7 and it will be readily seen that when the block is in place, the set screw may be ti htened to bring its end into engagement with one side of the block and torce the block over towards the heel or arm or the movable jaw. The block will, therefore, be securely held in the pocket and cannot slip out of place or be jolted out when the mowing machine is moving over rough ground. As long as the block ains in place the movable jaw will be securely held in the operative position but as soon as this block is removed after loosening oi the set screw, .the movable jaw may be easily swung to an inoperative position to release the rod which is operated by the pitman. V v hen in this position it is only necessary to remove the pivot pin or rivet E53 and the movable jaw will then be easily liited out of the socket 6. Suitable cleaning or repairing can then be performed and the movable jaw or if necessary a new one then put back in place and secured by pasring the pivot pin axially through the trunnion and head off the pitman below the sock ct It will thus be seen that there has been provided. pitman having an improved type of movable jaw and jaw receiving portion and further that there has been provided a movable jaw which may be securely held in an operative position and braced against upward movement out of the jaw receiving socket of the pitman.

Having thus described our invention, we claim 1. r pitman comprising a bar having a rigid jaw extending from its outer end, said bar having a bearing socket opening through the upper f ee and outer end of the bar and a pocket leading inwardly oi the bar from the socket and opening through the upp face of the bar, the communication of the recess with the socket being restricted with respect to the socket, the meeting ends of the side walls of the recess and socket constituting inwardly disposed ribs, a movable jaw having a portion enlarged to provide a trunnion fitting into said hearing socket to mount the movable jaw for movement towards and away from the stationary jawand an arm extending from the trunnion into said pocket, and means detachably mounted in the pocket for engaging said arm and re movably holding the movable jaw swung to an operative position adjacent the stationary jaw.

2. A pitman comprising a bar having a rigid jaw extending from its outer end and having a bearing socket adjacent the inner end of the rigid jaw and a pocket leading from said bearing socket, the communication of the recess with the socket being restricted with respect to the socket, the meeting ends of the side walls of the recess and socket constituting inwardly disposed ribs; a movable jaw having a jaw portion for co-operating with the rigid jaw, the inner end of the jaw portion of the movable jaw being enlarged to provide a trunnion and fitting into said socket to mount the movable jaw for swinging movement towards and away from the stationary jaw, a heel extending from said trunnion into a pocket, means for bracing the movable jaw against movement axially of the trunnion when the movable jaw is in an operative position with respect to the stationary jaw, and detachable means fitting into said pocket for engaging the heel and releasably holding the movable jaw in an operative position.

3. A pitman comprising a bar, a stationary jaw carried thereby, a pitman bar having a bearing socket adjacent the inner end of the stationary jaw and a pocket leading from said bearing socket, a movable jaw having a jaw portion for co-operating with the stationary jaw and a trunnion fitting into said socket to mount the movable jaw for swinging movement towards and away from the stationary jaw, and a heel extending from said trunnion into said pockat, the movable jaw and heel being provided with ribs for fitting into rib receiving recesses formed in the pitman to hold the movable jaw against movement axially of the trunnion when the movable jaw is in an operative position with respect to the stationary jaw, a block fitting into said pocket to engage said heel and retain the movable jaw in the operated position and means for releaseably securing said block in place.

4. A pitman comprising a body having a stationary jaw carried thereby, a movable jaw pivotally connected with said pitman tor swinging movement towards and away from the stationary jaw, and a wedging block removably carried by the body of said pitman for engaging said movable jaw when in place and securely holding the movable the stationary jaw, said block when applied or removed moving in a direction substan tially parallel to the axis about which the movable jaw swings.

5. A pitman comprising a body having a stationary jaw carried thereby, a movable jaw pivotally connected with said body for swinging movement into and out of an operative position with respect to the stationary jaw, a block movable into and out of engagement with the body of said pitman and when in place having engagement with said movable jaw to retain the same in an operative position, said block when applied or removed moving in a direction substantially parallel to the axis about which the movable jaw swings and means for releasably securing said block when in place.

6. A pitman comprising a body including a head and heels extending from said head, a stationary jaw carried by said head, a movable jaw pivotally connected with said head for swinging movement towards and away from the stationary jaw and limited in its swinging movement, means for holding said movable jaw in an operative position, said means removably carried by said head and when in place having engagement with the movable jaw and means for securing said aw retaining means in place, said holding means when applied or removed having movement substantially parallel to the axis about which the movable jaw swings.

7. A pitman comprising a bar having a rigid jaw, a swinging aw carried by the bar and having movement toward or from the ri 'id jaw and coacting means carried by said jaws interlocking when the jaws are in closed position, said coacting means being arranged forwardly and rearwardly of the axis about which the swinging jaw has movement.

8. A pitman comprising a bar having a rigid jaw and having a bearing socket adjacent the inner end of the rigid jaw, a movable aw having a trunnion seating within the socket when said movable jaw is in open position, said jaws having coacting means interlocking when the movable jaw is in closed position to hold the trunnion against displacement within the socket, said coacting means being arranged forwardly and rearwardly of the trunnion.

In testimony whereof we hereunto aflix our signatures.

CLAUDE SLY. JOHN EDWARD MONTGOMERY, HERVEY THOMAS TRANMER. 

